Printing-press.



J. THOMSON.

PRINTING PRESS.

APPLIOATIOHYI'ILED DEO.16,1909.

Patented Jan. 3, 1911.

33% his 6 W2? I WM ji M THE NDRRls PETERS c0, wAsnmcmN. 0- c4 UNITEs'rn'rns PATENT OFFICE.

JOHN THOMSON, OF NEW YORK, N. Y., ASSIGNOR TO JOHN THOMSON PRESSCOMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

PRINTING-PRESS.

oaeaai.

To all whom it may concern:

Be it known that I, JOHN TrIoMsoN, a citizen of the United States, and aresident of the borough of Manhattan of the city of New York, in thecounty and State of New York, have invented certain new and usefulImprovements in Printing-Presses, of which the following is aspecification, reference being had to the accompanying drawings, forminga part hereof.

The invention relates to improvements in printing presses and inparticular to improvements in the construction and operation of theink-fountains thereof.

The main objects of the invention are to obtain a more delicate anddefinite control of the film of ink to be transmitted by theink-cylinder to the ductor-roller; to effectually lock the adjustingscrews from being shifted by the vibration of the press; and tofacilitate cleaning the fountain when chang ing from one color or gradeof ink to another.

The .invention will be more fully described in connection with theaccompanying drawings in which enough of a printing press has been shownto illustrate the improvements.

In said drawings: Figure 1 is a view in transverse section of theink-fountain, and, Fig. 2 is a plan view of a part of the fountain blademember detached from the fountain, as seen from the under side.

The fountain roller a is suitably ournaled in the frame I) of thefountain and, mounted in operative relation therewith, is the inkblade 0which preferably consists of a steel plate of the ordinary form.Underneath this primary ink-blade c is a supplemental ink-blade d which,as shown in Fig. 2, is slotted, thus simulating the form of a comb andwhich also is preferably formed from a steel plate. These two blades orplates are separated from each other, at the edge near the cylinder, bya yielding strip 6, which may be of rubber, leather or some othersuitable material, and at the other edge, by a rigid strip f whichpreferably is of metal. As thus assembled, the plates and separatingstrips are riveted together (the rivets being shown at g) and are thusmade to constitute practically. an integral member which may be secureddown upon the frame by attaching screws it. When thus attached, theinner edge of the primary inkblade 0 should preferably be about .07 to.10 of an inch away from the cylinder, and the v Specification ofLetters Patent.

Application filed December 16, 1909.

Patented Jan. 3, 1911.

Serial No. 533,446.

angle of the blade is preferably about to 70 from the vertical.Cooperating with this member are adjusting means, such as screws 2',which are threaded in the frame Z) and which engage respectively thetongues of the slotted blade d, being arranged at an acute angle withthis blade, all of which can be done by mounting the screws at about 90from the vertical in the frame 6. In this wise, the teeth of the combform distinct springs, which, when forced forward by the screws, impartmovement through the yielding strip to a portion only of the primaryink-blade. Per 00mm, when a screw is withdrawn the correspondingspring-tongue is free to follow it, removing the tension from a limitedsection of the primary blade.

The advantages of the construction are obvious. The locating of theadjusting screws, for instance, so that their axes will lie at an acuteangle to the blade, not only makes the rise or fall of the blade lessfor any given movement of the screws, but the reacting thrust of thespring tongues clamps the screw threads and most securely locks thescrews against shift-ing. As the ink generally used for the finerclasses of printing is exceedingly dense and very viscous, itsfrictional adherence to the cylinder is frequently so great that the inkmay be observed to roll upon itself as indicated by the broken lines isin Fig. 1. Moreover, it is of first importance that the ink-blade shallbe flexible along the length of the cylinder so that an ink-film of avarying thickness may be drawn off, whereby to adapt the supply to aform having light and heavy portions on its surface, and yet which shallbe relatively very rigid when set and delicately responsive to theadjusting screws. Finally, it is desirable that the fountain may beconveniently and expeditiously cleaned. which advantage is possessed bythe present construction in a considerable degree from the fact that theblades and strips can be withdrawn as an integral member from thefountain by simply loosening the attaching screws h, whereby all partsof the fountain may be easily gotten at.

The ductor-roller is indicated by the dot and dash lines Z in Fig. 1 andwill enable the relation of the fountain to the rest of the press to beunderstood without further illustration.

Various changes may be made in the construction shown and describedWithout departing from the spirit of the invention.

I claim as my invention:

1. In a printing press, the combination With the inkcylinder, of aprimary inkblade, a slotted supplemental blade, a yielding stripseparating said blades at the edge near the cylinder, and a rigid stripseparating said blades at the other edge.

2. In a printing press, the combination with the ink-cylinder and theframe, of a primary ink-blade, a slotted supplemental blade, the saidblades being secured along one edge to the frame, a metallic stripseparating said blades near said edge, and a 15 yielding stripseparating said blades at the other edge near the cylinder.

This specification signed and witnessed this eleventh day of December,A. D., 1909.

, JOHN THOMSON.

Signed in the presence of E. E. KIROHER, H. C. Cross.

